Lock



B, GREENISVONV.

LOCK.

APPLICATION FiLED FEB, 3, 1921. 1,409,094. Patented Mar- 7,1922. I .1.x. I I 7 /y 2 wk 59 6 i1 X\\\\\ Em 4 g 2 WITNESSES IMVENTOR v 5GREEN/SON ,4 TTOR/VEYS UNITED. STATES BURT GREENISON', OF NEW YORK, N.Y.

' LOCK.

, Application filed February 3, 1921.

To all whom it may concern.-

Be it known that I, BURT-GREENISON, a citizen of the United States, andresident of the city of New York,'borough of Manhattan, in the countyand State of New York, have invented a new and Improved Look, of whichthe following is a full,'clear, and exact description.

My invention relates to locks, and aims to provide certain improvementsin connection with the same. v

It is a well appreciated fact that it has been customary to provide alock mechanism serving to retract and project a bolt, such lockmechanism being associated with'o'ne face of the closure to be locked.It has also been customary upon the other face, to provide a knobpermitting of a' manual retrac tion of the bolt without the necessity ofutilizing a key.

These locks, While serving to a certain ex tent to prevent the openingof the closure by an unauthorized person, have nevertheless failed, inthat any person" familiar with the operation of the lock would have toolit; tle' difliculty in forcing the same. In some instances, it has noteven been necessary to resort to this action, as a skeleton or duplicatekey would permit of a ready opening of the closure with which the lockis associated.

Having these and other defects to reduce the risk of an unauthorizedperson opening the closure, to a minimum.

This is to be predicated to the fact that my invention aims to'providemeans serving to effectually prevent a retraction of the bolt by meansof even a skeleton or duplicate key, and renders the same solelyinaccessible aside from the fact that it holds the bolt against motion,and that the bolt is incapable of being forced to its retractedposition.

Still another object of my invention-is the provision of a lock of thecharacter stated, in which a special form of key will be necessary toeffect an operation of the bolt, the appearance of this look in no waydifi'erem tiating from that of a conventional lock, so that anunauthorized person would be led to believes that a conventionalskeleton or master key would be capable of effecting an opening of theclosure.

Further objects of my invention will appear in the annexedspecificationand draw- Speciflcation of Letters Patent.

to a slightly different he incapable of being in mind, I haveconstructed a look by means of which primarily, the structure provided,will serve to further prevent any lffat'ented Mar. 7, 1922. Serial No.442,332.

ings which latter present one practical embodiment of my invention, andin which Figure 1 is a sectional side view of a lock tconstructed inaccordance with my inven- Figure 2 isa-sectional view taken along theline 2-2 of Figure 1.

Flgure 3 is a sectional view taken along the line 33 of Figure 1. 1

Figure 4 is a' face view of the rear of the closure with which myimproved lock-is associated.

Figures 5 and 6 are perspective views, of certain of the essentialelements forming a part of my invention, and) Figure 7 illustrates myinventionapplied form of lock. Referrin ure 3, it Wlll be seen that thereference numeral 10 indicates the jamb with which the closure 11co-operates in'the usual manner. Contrary to the conventional construc-.tion, it ,will be noted that the keeper 12, does not provide an opening,but furnishes a socket'13, for the reception of the bolt 14, such socketbeing preferably of the same material as thekeeper 12, and alsoconveniently forming an integral portion of the same.

Thus it will beobvious that a jimmy would forced between the closure, 11and jamb 10 for the purpose of engaging the rear end of the bolt 14.- toeffect a retraction of the same, but aside from this safe-guard, Iprovide structure serving retraction of the bolt now-m0re particularlyto Fig- 14 by an extraneous member, this structure being hereinaftermore fully specified.

Referrin now nore particularly to Figure '1, it Wlll be seen that thereference numeral 15 indicates a lock of any desired constructionapplied in the usual manner to the closure 11, and serving to permit ofan authorized operation of the bolt 14. This lock, in the usual mannerco-operates with a spindle 16 extending through the entire body oftheclosure 11, and having a knob 17 secured to its outer end, which knobwill permit of a rotation of the spindle 16 without the necessity ofutilizing a key.

In connection with the elements 14 and 16,

opening being formed with a series of teeth- 19 or other suitableelements co-operating with the teeth 20 of thespindle'16. Thus it willbe noted, that a firm inter-engagement of the spindle and bolt ispermitted, and that master'key, to efiect an opening of the closure 11,it will be noted, reference beinghad to Figures 1 and 2, that a plate 21is firmly fixed to the closure 11, as at 22 and" encircles the spindle16. This plate provides, a notch or opening 23 directly underlying theknob 17, and'it will be noted that a spring pressed plunger 24 isassociated with the knob and arranged within the body of the same at aoint at which it will be capable of moving into the depression 23 whenthebolt- 14 is in fully projected position.'

It will thus be seen that when the plunger is in the position indicatedin dotted lines in Figure 1, that even a person provided 'with a keycapable of efiecting an operation of the spindle 16, will be unable toeffect a rotation of the spindle 16, and to provide means serving topermit of an operation of the plunger 24 only when it is desired,it'will be'noted that I preferably provide an operating handle25 aflixedto the outer end of the same, such operating handle being capable ofbeing turned and being adapted to rest in one'of two slots, 26 or 27. Itis to be noted that the base of these slots or grooves lie in differentplanes, the said grooves being arranged at an angle with respect to eachother. Thus upon the handle 25 lying in the slot 27, it will be seenthatthe plunger 24 will be held in its retracted position, but that a personmay lift and rotate the handle 25 and permit the same to move into thegroove 26, which being of greater depth allows the outer end of theplunger to move to the position indicated in dotted lines, thusefi'ectually preventing any movement of the spindle 16 by any personwithout the plunger 24 being again retracted. a

Referring now more particularly to the structure illustrated in Figure7, it will he seen that the same includes the bolt'14, pro.- vidi'ngteeth 19, and co-operating with a spindle .28, it being noted that thekey slot 28 of the spindle 28 extends throughout the entire length'ofthe same, and that contrary to the utilization of the knob 17, a lock30 is arranged at this point, which look is a duplicate of the lock 15.

Thus it will'be'noted that the lock, constructed in accordance with'thislatter embodiment of myinvention will provide the identical appearanceosfthe customary look, but in the event. that 'a master or skeletonkeyis utilized, it will be appreciated that any retraction of the bolt14 will be precluded, in that it will be necessary to utilize a keyextending throughout the entire length of the door 29, and arranged withelements corresponding to the elements. of the locks .15 and 30, withWhlCh it is to co operate.

Front the foregoing it will be seen that I have constructed a lock,which will, as

nearly; as possible, preclude an unauthorized person from manipulatingthe same, in I that it will be virtually impossible to'manipulate thebolt by askelton ormaster key, aside from the fact that the bolt isarranged in. such a manner as to be inaccessible to the use of a jimmy,it being also noted that even if the same element should tend to effecta retraction of the bolt 14 this will be pre cluded in that it will beimpossible to return the spindle 16, thus virtually holding the boltagainst movement.

It will furtherbe apprec ated that numerous modifications of structuremay readily be resorted to within the scope of my claims: l. A look,including a bolt, a spindle oooperating with said bolt for effecting amovement of the same, said spindle extendingtransversely of said boltand beyond the side edges thereof, a lock secured to one end ofsaidspindle, aknob secured to the opposite end of thesame, said knob beingformed with grooves extending at angles to. each other, and being ofdifferent depths, a spring pressedplunger secured to said knob, aplateencircling said spindle, a head secured to said plunger, said head beingadapted to seat in either of said grooves and when lying in the deeperof the same extending into an opening forming apart of said plate.

2. A lock including a bolt having an opening presenting a toothedportion, a spindle, an annular series of teeth forming a part of saidspindle. said latter teeth being adapted to coact with saidfirst-mentioned teeth, and a lock forming a part of said spindle.

BURT GREENISON.

